Bitcoin, Litecoin and Monero, each for a reason.
Nexus accepts three coins, one more than most markets, and each answers a different need.
Monero is the privacy default, the coin to use when you do not want the payment legible on a public ledger. Litecoin is the small-order coin, faster and cheaper than Bitcoin when the network fee would be out of proportion to a modest purchase. Bitcoin is there for the vendors who still price in it.
Default to Monero unless a vendor forces otherwise. If you pay in Bitcoin, do not send straight from an identity-checked exchange, because that ties your name to the deposit. Route through a fresh wallet or swap into Monero first. Deposit addresses are issued fresh per order.
Bitcoin and Litecoin write the amount and both addresses to a ledger anybody can read, for as long as the chain exists. That is not a flaw, it is what the design does. Monero produces no public record at all: ring signatures blend the spend with decoys, stealth addresses mean the chain never shows the real recipient, and the amount is concealed while the network can still verify the arithmetic.
Litecoin confirms in a couple of minutes and its fees stay low and predictable. Bitcoin takes ten minutes a block and its fees float with demand, so a fee that was generous last week can be too low today. Monero sits between them at roughly two minutes. All of these differences are over within an hour of sending. The ledger difference is permanent, which is why it should decide the choice.
Wallets differ on one behaviour. Some subtract the network fee from the figure you typed, so slightly less arrives than the order asked for. Others add it on top. Neither is wrong and only one funds an order correctly. The shortfall is usually smaller than the rounding on the price, which is exactly why it catches careful people and leaves an order sitting unfunded while everything looks fine.
Fewer places list it and some have removed it. The routes are a large exchange that still carries it, a peer trade, or an accountless swap from a coin you already hold. Each attaches a different amount of identity at the point of purchase, and that purchase is the part worth thinking about rather than the spend itself.
Move the coin through a wallet you control before it reaches an order. Sending straight from wherever you bought it draws a line from an identity checked account to a marketplace, and no amount of protocol privacy undoes a line you drew yourself.
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